如何从数组中删除对象?我想删除,其中包括名称的对象Kristian从someArray。例如:
Kristian
someArray
someArray = [{name:"Kristian", lines:"2,5,10"}, {name:"John", lines:"1,19,26,96"}];
我要实现:
someArray = [{name:"John", lines:"1,19,26,96"}];
您可以使用多种方法从数组中删除项目:
//1 someArray.shift(); // first element removed //2 someArray = someArray.slice(1); // first element removed //3 someArray.splice(0, 1); // first element removed //4 someArray.pop(); // last element removed //5 someArray = someArray.slice(0, a.length - 1); // last element removed //6 someArray.length = someArray.length - 1; // last element removed
如果要删除position处的元素x,请使用:
x
someArray.splice(x, 1);
要么
someArray = someArray.slice(0, x).concat(someArray.slice(-x));
您可以使用Array.filter或Array.splice结合使用Array.findIndex参见MDN从数组中删除一个或多个元素,例如
Array.filter
Array.splice
Array.findIndex
// non destructive filter > noJohn = John removed, but someArray will not change let someArray = getArray(); let noJohn = someArray.filter( el => el.name !== "John" ); log("non destructive filter > noJohn = ", format(noJohn)); log(`**someArray.length ${someArray.length}`); // destructive filter/reassign John removed > someArray2 = let someArray2 = getArray(); someArray2 = someArray2.filter( el => el.name !== "John" ); log("", "destructive filter/reassign John removed > someArray2 =", format(someArray2)); log(`**someArray2.length ${someArray2.length}`); // destructive splice /w findIndex Brian remains > someArray3 = let someArray3 = getArray(); someArray3.splice(someArray3.findIndex(v => v.name === "Kristian"), 1); someArray3.splice(someArray3.findIndex(v => v.name === "John"), 1); log("", "destructive splice /w findIndex Brian remains > someArray3 =", format(someArray3)); log(`**someArray3.length ${someArray3.length}`); // Note: if you're not sure about the contents of your array, // you should check the results of findIndex first let someArray4 = getArray(); const indx = someArray4.findIndex(v => v.name === "Michael"); someArray4.splice(indx, indx >= 0 ? 1 : 0); log("", "check findIndex result first > someArray4 (nothing is removed) > ", format(someArray4)); log(`**someArray4.length (should still be 3) ${someArray4.length}`); function format(obj) { return JSON.stringify(obj, null, " "); } function log(...txt) { document.querySelector("pre").textContent += `${txt.join("\n")}\n` } function getArray() { return [ {name: "Kristian", lines: "2,5,10"}, {name: "John", lines: "1,19,26,96"}, {name: "Brian", lines: "3,9,62,36"} ]; } <pre> **Results** </pre>